张仲景云∶肠痈之证，因饮食积热，或母食辛热之物所致。小腹按之则痛，小
便数似淋，腹急，恶寒，身皮甲错，或自汗恶寒，若脉迟紧，未有脓者，用仙方活
命饮以解其毒。脉洪数，已有脓者，服太乙膏以下其脓。小腹疼痛，小便不利者，
脓壅滞也，牡丹皮散主之。
窃谓、经云∶肠痈为病，不可惊，惊则肠断而死。故坐卧转侧之间，须令徐
缓，时少饮薄粥，及用八珍汤固其元气，静养调理，庶可保也。
大黄汤 治肠痈，小腹坚肿，按之则痛，肉色如常，或 赤微肿，小便频数，汗出
憎寒，脉紧，脓未成也，急服之。
大黄（炒） 朴硝（各一钱） 牡丹皮 栝蒌仁 桃仁（去皮尖，各二钱）
每服二三钱，水煎。
薏苡仁汤 治肠痈腹中痛烦躁不安，或胀满不食，小便涩滞。
薏苡仁 牡丹皮 桃仁（各三两） 栝蒌仁（四两）
上，每服四钱，水煎。
桃仁汤 治肠痈腹中痛，烦躁不安，壅痛，大便闭涩。亦有绕脐生疮者，但用此药
无妨。
桃仁 大黄（炒） 牡丹皮 芒硝 犀角（镑） 冬瓜仁（研。各二钱）
上，水煎，入犀角末服。
牡丹皮散 治肠痈腹濡而痛，时下脓汁，或下血。
牡丹皮 人参 天麻 白茯苓 黄 （炒） 薏苡仁 桃仁 白芷（炒） 当归 川芎
官桂 甘草（各五分） 木香（二分）
上，每服三五钱，水煎。
Zhang Zhongjing stated: The syndrome of Changyong (intestinal abscess) arises from dietary accumulation and heat, or from the mother consuming pungent and hot substances. There is pain upon pressing the lower abdomen, frequent urination resembling Lin syndrome (strangury), abdominal urgency, aversion to cold, and skin that is dry and scaly like fish scales, or spontaneous sweating with aversion to cold. If the pulse is slow and tight, indicating that pus has not yet formed, Xianfang Huoming Yin (Immortal Life Elixir Decoction) should be used to resolve toxicity. If the pulse is surging and rapid, indicating that pus has already formed, Taiyi Gao (Great One Plaster) should be taken to drain the pus. If there is lower abdominal pain and difficulty in urination, this indicates stagnation of pus, which is primarily treated with Mudanpi San (Moutan Cortex Powder).
I hold that: The classics state: In cases of Changyong (intestinal abscess), one must avoid fright; if frightened, the intestines may rupture leading to death. Therefore, during sitting, lying down, turning, or shifting positions, movements must be slow and gentle. Occasionally drink thin congee, and use Bazhen Tang (Eight Treasure Decoction) to consolidate Yuanqi (primordial qi). Through quiet rest and regulation, life can be preserved.
Dahuang Tang (Rhubarb Decoction): Treats Changyong (intestinal abscess) characterized by hardness and swelling of the lower abdomen, pain upon pressure, normal muscle color or slight redness and swelling, frequent urination, sweating with aversion to cold, and a tight pulse, indicating that pus has not yet formed. It should be taken urgently.
Ingredients: Dahuang (Rhei Radix et Rhizoma, stir-fried), Puxiao (Natrii Sulfas, each 1 qian); Mudanpi (Moutan Cortex), Gualou Ren (Trichosanthis Semen), Tao Ren (Persicae Semen, peeled and removed of kernels, each 2 qian).
Usage: Take 2-3 qian per dose, decoct in water.
Yiyiren Tang (Coix Seed Decoction): Treats Changyong (intestinal abscess) with abdominal pain, restlessness, or distension and anorexia, and obstructed urination.
Ingredients: Yiyiren (Coicis Semen), Mudanpi (Moutan Cortex), Tao Ren (Persicae Semen, each 3 liang); Gualou Ren (Trichosanthis Semen, 4 liang).
Usage: For the above ingredients, take 4 qian per dose, decoct in water.
Tao Ren Decoction: Treats Changyong (intestinal abscess) with abdominal pain, restlessness, stagnation pain, and constipation. In cases where sores appear around the umbilicus, using this medicine is also safe.
Ingredients: Tao Ren (Persicae Semen), Dahuang (Rhei Radix et Rhizoma, stir-fried), Mudanpi (Moutan Cortex), Mangxiao (Natrii Sulfas), Xijiao (Rhinocerotis Cornu, sliced), Dongguaren (Benincasae Semen, crushed, each 2 qian).
Usage: Decoct the above ingredients in water, and take with powdered Xijiao (Rhinocerotis Cornu).
Mudanpi San (Moutan Cortex Powder): Treats Changyong (intestinal abscess) with a soft but painful abdomen, discharge of pus or blood.
Ingredients: Mudanpi (Moutan Cortex), Renshen (Ginseng Radix et Rhizoma), Tianma (Gastrodiae Rhizoma), Baifuling (Poria, stir-fried), Huangqi (Astragali Radix, stir-fried), Yiyiren (Coicis Semen), Tao Ren (Persicae Semen), Baizhi (Angelicae Dahuricae Radix, stir-fried), Danggui (Angelicae Sinensis Radix), Chuanxiong (Chuanxiong Rhizoma), Guigui (Cinnamomi Ramulus), Gancao (Glycyrrhizae Radix et Rhizoma, each 5 fen); Muxiang (Aucklandiae Radix, 2 fen).
Usage: For the above ingredients, take 3-5 qian per dose, decoct in water.